Adjustable cylinder hone



D -3, 935- F. M. KERN HAL 2,023,082

ADJUSTABLE CYLINDER HONE Filed May 15, 1951 INVENTOR 6. Fred M #9777,

y/h m 6247171071 NEYS.

Patented Dec. 3, 1935 UNITED STATES ADJUSTABLE CYLINDER HONE Fred M. Kern and Kirke W. Connor, Detroit,

Mich., assignors to Micromatic Hone Oorporation, a corporation of Michigan- Application May 15, 1931, Serial No. 537,576

7 Claims. (Gl- 51-4844) This invention relates to hones and particularly to a hone of the rotatable type which is employed for finishing the inner surface of cylindrical members such as cylinders for internal combustion engines. I

Hones of the above mentioned type have been employed heretofore which were expansible a predetermined amount for the purpose of adjusting the diameter of the honing elements relative to the diameter of the cylinder to be honed. The honing elements could be expanded only a small amount and it required several sizes of adapters to have the honing tool cover the complete range of cylinder diameters employed on passenger automobiles to be found in the present day art.

This invention includes the provision of. a honing tool which is constructed in such manner as to enable the honing elements to be expanded and contracted such an amount as to cover the com= plete range of cylinder diameters employed in present day passenger automobiles.

This degree of expansion is effected by providing element supporting members with arms which project beyond the center line of the tool. One side of each of the arms is provided with lands and grooves positioned at an angle for engaging similar lands and grooves provided on a centrally I disposed, longitudinally movable-actuating member. The longitudinal movement of the actuating member causes the respective lands and grooves to slide relative to each other to eflect the inward oroutward movement, as the case may be, of the honing element. The arms are of such length as to extend the maximum distance and just come within the radius of the honing elements when they are contracted to efiect a minimum diameter.

The actuating member is of square shape, havmg lands and grooves disposed on all four of its sides for engaging the arms of four element supporting members. The longitudinal movement of. the actuating member is effected by an internally threaded knob which operates on a threaded end of the member. The thread is of small pitch to require a maximum amount of rotation of the knob to provide a small movement of the actuating member longitudinally and also the movement of the element supporting members laterally.

The element supporting members'are provided with spring clamping means for engaging the elements which are insertable in a channel like member thereof. The spring elements has a protruding and which is biased upwardly over one of the flanges of the channel like member to engage a side of the element. The central portion of the element has an inwardly extending portion which registers with an aperture in the supporting web which prevents the longitudinal movement of the element relative to the supporting member.

A pair of trunnions is provided on the central body portion of the honing tool which are engageable by the end of a universally jointed memher which extendsabove the honing tool and is 10 provided with a tool engaging end portion which is engageable-by a motor actuated tool driving device well known in the art, for the purpose of rapidly rotating the hone. The honing tool has two oppositely disposed honing elements provided with arcuate engaging surfaces and with two oppositely disposed members made of cork disposed midway between the honing elements and provided with arcuate surfaces for engaging and wiping the sides of the cylinder to be honed. The corkmembers also aid in centering the hone in the cylinder and in supporting the honing tool in the cylinder when the operating mechanism is detached therefrom.

Accordingly, one object of the inventionis to provide a hone of the above mentioned type which is expansible over a range which is sufficient to e the walls of the cylinders of all passenger automobiles employed today.

Another object of the invention is to provide a honing tool of the above mentioned type with an actuating member which shall effect a lateral movement to the honing element when moved longitudinally by a threaded knob which engages a threaded end thereof.

A further object of the invention is to provide a honing tool of the above mentioned type with an element supporting member having a central aperture and an adjacent spring latching member which releasably retains the honing and wlping elements on the channel member thereof.

A still further object of the invention is to provide a honing tool of the above mentioned type' with a plurality of trunnions and with a trunnion engaging element having universal movementwhich enables the hone to be actuated when the actuating rod is positioned at an angle and which permits the separation of the actuating member from the hone ,to permit themea'surement of the cylindrical diameter without the necessity of removing and readjusting the honing.

ML a

A still further object of the invention is to provide members made of cork on the arms posi-' tioned between the honing element supporting 5 arms for frlctionally engaging the sides of a cylinder and supporting the honing tool when disconnected from the actuating device.

Other objects and features of novelty of the invention will either be specifically pointed out,

or will become apparent when referring, for a better understanding thereof, to the following description in connection with the accompanying drawing, wherein- Figure 1 is an elevational view of a honing tool embodying features of the invention.

Fig. 2 is a sectional view of the structure shown in Fig. 1 taken on the line 22 thereof.

Fig. 3 is a broken sectional view of the structure shown in Fig. 2 taken on the line 3-3 thereof.

Fig. 4 is a sectional view of the structure shown in Fig. 3 taken on the line 4-4 thereof.

Fig. 5 is a sectional view of the structure shown in Fig. 3 taken on the line 55 thereof.

Fig. 6 is a sectional view of the structure shown in Fig. 3 taken on the line 6-4; thereof.

Fig. 7 is a view in elevation of an adjusting washer employed with the honing tool, and

Fig. 8 is a reduced broken view, in elevation, of a honing tool and operating mechanism mounted in a cylinder.

' The invention comprises in general a central nicate with and are tangentially disposed to the central opening of the frame member. The upper portion of the frame is provided with a shouldered recess I! in which the operating knob i4 is retained against longitudinal movement by the projections l8 on the end of the threaded trunnions l9 which engage a slot 2| on the lower periphery of the knob. Ball bearings 22 are provided between the shoulder of the recess l1 and the bottom surface of the knob 14 for the purpose of eliminating friction between the two surfaces when the knob is rotated.

The actuating member I3 is threaded on its upper end with a thread 23 of relatively fine pitch, which is engageable by a thread 24 provided in the central opening of the knob. l4. The

rotation of the knob l4, relative to the frame' knurled surface 29 is provided on the sideof the knob to provide a finger hold when the knob is to be rotated. .The pin. 26 indexes the movement of the knob relative to the frame member II and retains the knob in predetermined position relative to the member after the adjustment of the knob has been accomplished.

The four sides of the square actuating member l3 are p vided with lands 3| and grooves 32 positioned in angular relation relative to the iongitudinal dim ons of the actuating member and slope in op site directions on opposite surfaces thereof. That is to say, the lands andgrooves on one side of the actuating member slope to the right, while the lands and grooves on the opposite side of the member slope to the left, the purpose of which will be explained hereinafter. 1

The elements supporting member l5 are four in number and are each provided with an element engaging portion 33 of channel shape having two cylindrical arms 34 extending from the web portion thereof in an opposite direction to the flanges of the channel shaped portion. The arms are spaced from each other and register with apertures H5 in the frame member, with the arms on two of the channel members disposed a greater distance apart than the arms on the other two channel members, for the purpose of permitting the arms to cross each other when mounted in the frame member, as illustrated in Fig. 3.

The inner surface of the arms 34 are provided 'with lands and grooves 35 which are angularly disposed and are of such slope as to register with the grooves 32 and the lands 3!, respectively, of the actuating member l3. The mounting of the arms 34 tangentially to and in engagement with the sides of the actuating member I3, position the honing elements in adva'nce of the center line through the honing tool, to efl'ect a maximum amount of erosion of the engaging surface of the cylinder wall for a predetermined amount of pressure.

When the actuating member i3 is moved 1ongitudinally, the sliding of the lands thereof in the respective grooves of the arm 34 causes a lateral movement of the supporting members l5 toward and away from the frame member] i, controlled by the direction of movement of the actuating member l3. As mentioned hereinabove, the lands and grooves are oppositely disposed angularly on opposite sides of the actuating member and are positioned in this manner for the purpose of effecting an opposite movement to the element supporting members l5, which project in opposite directions from the frame member I I. The arms 34, on the elements supporting members 15, retain them axially aligned with the actuating member i3 and the elements, which are supported thereby, are retained in longitudinal parallel relation to each other.

The honing elements comprise an abrading element 36 which is rigidly attached to a channel shaped member 31 of such over all width as to be receivable within the confines of the flanges -of the channel shaped portion of the supporting member ii. In Fig. 3, we have illustrated the flange member 31 as being provided with a rearwardly extending projection 38 which registers with an aperture 39 provided in the element supporting member I5 for the purpose of preventing the relative longitudinal movement between the members.

A latchingmember 4| is constructed from flat spring steel and is riveted or otherwise attached to the central portion of the element supporting member IS an dis bent backwardly upon itself at 42 and flanged inwardly at 43 to extend over the flanges of the channel shaped member 33 and 31. The engagement of the flange 43 with the flange of the channel member 31 retains the channel member and therefore the abrading element 36 in fixed relation to the element supporting member l5. This construction eil'ects the flrm retention of the honing element in the element supporting member I! of the honingtool, which element is readily removable therefrom'by pressing against the portion 42 of the latching member for causing the flange 43 thereof to bewithdrawn from engagement with the flange of the operation.

channel member 31, to permit the channel'member and'the associated abrading member 36 to. be removed from the honing tool.

Referring to Fig. 2 it will be noted that two of the oppositely disposed supporting members l5 are employed for receiving and supporting abrading elements 36 for the purpose of effecting the honing of a cylinder. Diametrically disposed to each other and positioned. between the abrading members 36 two wiping elements 45' are employed, which are supported in channel members 31 in the same manner as the abrading members 36 are retained therein. Various materials may be employed for constructing the wiping elements such as felt, wood, leather or the like, and it has been found from experiments that cork effects the most desirable result and is therefore a preferred material to be employed for constructing the wiping element.

The cork has considerable resiliency and the proper and uniform wearing properties which permit the honing elements to engage the cylinder wall with a predetermined pressure during the time the pressure of the wiping elements is.

.sufiicient to retain the honing tool within the cylinder when disconnected from its driving and supporting member. The engaging surfaces of the wiping elements 45 are of arcuate shape similar to the arcuate shape provided on the abrading members 36 which effect smooth engaging areas in contact with the cylinder wal1..

Experiments have disclosed that two of the honing elements are sufiicient to finish the cylindrical grinding operation within a reasonable time and that the provision of the cork material 45 between the honing elements not only guides and supports the honing tool in parallel relation to the cylindrical surface, but also cleans and wipes the surfacein such manner as to effect a much higher polish and finish to the'surface. A further advantage of the cork material resides in itsinherent ability to wear proportionally to the amount of pressure applied thereto and to, therefore, wear in proportion to the amount the honing elements are worn away during the honing While the pitch of the threads'of the actuating member l3 may be such as to move the element supporting members laterally, the complete range of movement we preferably employ a larger pitch in order that the lateral movement of the supporting member is less than the movement of the longitudinal actuating member. When this relation obtains, a finer adjustment of the honing and wiping elements ensues when the knob I4 is adjusted. To expand the elements over the complete range of movement when the greater pitch of thread is employed, it is necessary to reset the threads in the arms with those of the actuating member.

Slots 63 are provided at the top of each of the threads which register with the recesses IS in the frame I I when the actuating member I3 is moved downwardly. In this position the arms 34 are released from engagement with the-actuating member and may be moved laterally in the recesses. In Fig. 'I we have illustrated a washer 54 havin a central hole 55 which permits the washer to be positioned over the cylindrical end 56' of the frame H. The overall dimension of the washer is such that; when the element receiving members ii are pushed inwardly toward the frame into engagement with the washer, the upward movement of the actuating member i3 causes the engagement of the threads 3| with the next suc- .'that it is within the purview of our invention to provide a cylindrical member which is keyed ceeding thread 35 of the arms and the complete longitudinal movement of the member actuates the elements 36 and 45 through the same expansible distance from a greater initial diameter. Further extension -is possible through the employ- 5 I ment of a washer 54 having a greater overall diameter to cause the teeth of the actuating member to initially engage the third tooth of the arms. The adjustment is limited by the length of the arms 34, being of such length as to extend within it) the minimum diameter of the honing elements when the'tool is in retracted position.

The trunnions 19, provided on the upper end of the frame H are engageable by an actuating member 41, as illustrated in Fig. 8. The actuating member 41 is of the bayonet type, being provided with a collar 48, having slots therein which register with the trunnions I9. The collar is pivotally mounted on a bifurcated extension of the operating shaft 49 to thereby effect a universally 20 movable connection therewith. The upper end of the shaft 49 is provided with a hexagon shaped extension 50 which may be engaged by a suitable tool driving mechanism 5| for the purpose of rapidly rotating our honing tool within the cyl- 25 inder.

The employment of a removable actuating member is advantageous in that the cylinder may be measured without the necessity of removing the hone therefrom. The honing tool may be 30 pushed toward the bottom of. the cylinder and the actuating member removed to permit access to the upper portion of the cylindrical surface to measure its diameter. The adjustment of the tool maybe made without the necessity of re- 35 moving the actuating mechanism therefrom, as the knob I4 is readily accessible through the universal joint of the connecting end of the shaft which enables the tool to be operated when the shaft is tilted at an angle.

While we have specified that the preferred embodiment of our invention utilizes a square longitudinally movable member, it is to be understood against rotation and provided with one or a plurality of threads oflarge pitch for engaging and actuating the arms 34.

While we have described and illustrated but a single embodiment of our invention, it will beapparent to those skilled in the art that various changes, omissions, additions and substitutions may be made therein without departing from the spirit and scope of our invention, as setforth in the accompanying claims.

We claim:

1. In a honing tool provided with a frame in which a member is movable longitudinally for effecting a lateral movement to the honing elements, an adjusting member for moving the longitudinally movable member, cooperating with a threaded end thereof, means for retaining the adof'a strengthening and supporting member on the rear portion of said honing element having a projection on the bottom web thereof and flanges on 75 its sides, the said receiving member being provided with an aperture in which said projection registers to prevent the longitudinal movement of a the members, and a latch on said receiving member for preventing the lateral movement of the element.

3. A latch for a-honing element comprising length of spring steel which is bent upon itself elements having means for adjusting said elements laterally. the said wiping elements being made of cork.

5. A wiping element for a honing tool disposed between the abrading elements thereof, and adjustable laterally therewith, the said wiping elements being made of cork. I

'6. A tool for honing the wall of a cylinder, hav- 1 ing at least one abrading element, and at least one additional element engageable with the cyl- 5 inder and made of cork.

7. The combination with a receiving member for a honing element of a rotatable honing tool, 01 a strengthening and supporting member on the rear portion of said honing element having a pro- 10 jection, the said receiving member being provided with an aperture in which said projection registers to prevent the longitudinal movement of said element relative to said receviing member, and a latch on said receiving member for 15 preventing the lateral movement of the element.

FRED M. KERN. v 'KIRKE W. CONNOR. 

